<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <script>
    let arr = [1,4,20,89,34,101,90];

    // let newArr = arr.filter(item => {
    //   if(item >= 80){
    //     return true;
    //   }
    //   return false;
    // });

    let newArr = arr.filter(item => item > 80);

    console.log(newArr);
  </script>
</body>
</html>